An Al-Zn-Si-Mg alloy coated steel strip

摘要

586491 Disclosed is an Al-Zn-Si-Mg alloy coated steel strip that comprises a coating of an Al-Zn-Si-Mg alloy on a steel strip. The alloy comprises in % by weight 40 to 60% Al, 40 to 60% Zn, 0.3 to 3% Si, and 0.3 to 10% Mg and unavoidable impurities. The microstructure of the coating comprises Mg2Si particles, and the distribution of the Mg2Si particles is such that there is no more than 10% by weight of the Mg2Si particles in a surface region of the coating that has a thickness that is less than 30% of the total thickness of the coating.